package com.sen.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sen.common.constant.WareConstant;
import com.sen.common.exception.NoStockException;
import com.sen.common.to.SkuHasStockVo;
import com.sen.common.to.mq.OrderTo;
import com.sen.common.to.mq.StockDetailTo;
import com.sen.common.to.mq.StockLockedTo;
import com.sen.common.utils.PageUtils;
import com.sen.common.utils.Query;
import com.sen.common.utils.R;
import com.sen.gulimall.ware.dao.WareSkuDao;
import com.sen.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.sen.gulimall.ware.entity.WareOrderTaskEntity;
import com.sen.gulimall.ware.entity.WareSkuEntity;
import com.sen.gulimall.ware.feign.OrderFeignService;
import com.sen.gulimall.ware.feign.ProductFeignService;
import com.sen.gulimall.ware.service.WareOrderTaskDetailService;
import com.sen.gulimall.ware.service.WareOrderTaskService;
import com.sen.gulimall.ware.service.WareSkuService;
import com.sen.gulimall.ware.utils.MQSenderUtil;
import com.sen.gulimall.ware.vo.OrderItemVo;
import com.sen.gulimall.ware.vo.OrderVo;
import com.sen.gulimall.ware.vo.WareSkuLockVo;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Slf4j
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private WareOrderTaskService wareOrderTaskService;

    @Autowired
    private WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;

    @Autowired
    private MQSenderUtil mqSenderUtil;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 1
         */
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (StringUtils.isNotEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (StringUtils.isNotEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果没有这个库存记录则新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>()
                .eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setWareId(wareId);
            skuEntity.setStock(skuNum);
            skuEntity.setStockLocked(0);
            //远程查询sku的名字，如果失败，这个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么方法让异常出现以后不回滚？
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");

                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            } catch (Exception e) {

            }
            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            //查询当前sku的总库存量
            /**
             * select sum(stock-stock_locked) from wms_ware_sku where sku_id = 1
             */
            Long count = this.baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * <p>
     * 库存解锁的场景：
     * 1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     * 之前锁定的库存就要自动解锁。
     *
     * @param vo
     * @return
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskEntity.setCreateTime(new Date());
        wareOrderTaskService.save(wareOrderTaskEntity);

        //1、按照下单的收获地址，找到一个就近仓库，锁定库存。
        //找到每个商品再哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuId(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (CollectionUtils.isEmpty(wareIds)) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败。前面保存的工作单信息都回滚了。即使要解锁库存，由于在数据库查不到指定的id，所以就不用解锁
            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功

                    WareOrderTaskDetailEntity taskDetailEntity = WareOrderTaskDetailEntity.builder()
                            .skuId(skuId)
                            .skuName("")
                            .skuNum(hasStock.getNum())
                            .taskId(wareOrderTaskEntity.getId())
                            .wareId(wareId)
                            .lockStatus(1)
                            .build();
                    wareOrderTaskDetailService.save(taskDetailEntity);

                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(wareOrderTaskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity, stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    mqSenderUtil.sendMessage(WareConstant.STOCK_EVENT_EXCHANGE, WareConstant.STOCK_LOCKED_ROUTING_KEY, lockedTo);

                    break;
                }
                //当前仓库锁失败，重试下一个仓库
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }

        //3、肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        Long id = to.getId();
        StockDetailTo detailTo = to.getDetailTo();
        Long detailId = detailTo.getId();
        /**
         * 解锁
         * 1、查询数据库关于这个订单的锁定库存信息
         *    有：证明库存锁定成功了
         *      解锁：订单情况。
         *          1、没有这个订单。必须解锁
         *          2、有这个订单。不是解锁库存
         *              订单状态：已取消，解锁库存；没取消，不能解锁
         *    没有：库存锁定失败了，库存回滚了。这种情况无需解锁
         */
        log.info("收到解锁库存的消息");
        WareOrderTaskDetailEntity entity = wareOrderTaskDetailService.getById(detailId);
        if (entity != null) {
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); //根据这个订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() != 0) {
                throw new RuntimeException("远程服务失败");
            }

            //订单数据返回成功
            OrderVo data = r.getData(new TypeReference<OrderVo>() {
            });
            if (data == null || data.getStatus() == 4) {
                //订单不存在或订单状态已取消，解锁库存
                if (entity.getLockStatus() == 1) {
                    //当前库存工作单是已锁定状态，才需解锁
                    unLockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(), detailId);
                }
            }

        }
    }

    /**
     * 防止：订单服务卡顿，导致订单状态一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了。
     * 导致卡顿的订单，永远不能解锁库存
     *
     * @param to
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        //查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        if (task != null) {
            //按照工作单找到所有 没有解锁的库存，进行解锁
            List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(
                    new QueryWrapper<WareOrderTaskDetailEntity>()
                            .eq("task_id", task.getId())
                            .eq("lock_status", 1)
            );

            for (WareOrderTaskDetailEntity entity : list) {
                unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
            }
        }

    }

    private void unLockStock(Long skuId, Long wareId, Integer skuNum, Long detailId) {
        //库存解锁
        wareSkuDao.unLockStock(skuId, wareId, skuNum);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity updateDetailEntity = new WareOrderTaskDetailEntity();
        updateDetailEntity.setId(detailId);
        updateDetailEntity.setLockStatus(2); //已解锁
        wareOrderTaskDetailService.updateById(updateDetailEntity);
    }

    @Data
    public class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}